9e07346679
SHF_GROUP: Group Member Sections ---------------------------------- A section which is part of a group, and is to be retained or discarded with the group as a whole, is identified by a new section header attribute: SHF_GROUP This section is a member (perhaps the only one) of a group of sections, and the linker should retain or discard all or none of the members. This section must be referenced in a SHT_GROUP section. This attribute flag may be set in any section header, and no other modification or indication is made in the grouped sections. All additional information is contained in the associated SHT_GROUP section. SHT_GROUP: Section Group Definition ------------------------------------- Represents a group section. The section group's sh_link field identifies a symbol table section, and its sh_info field the index of a symbol in that section. The name of that symbol is treated as the identifier of the section group. More information: https://mentorembedded.github.io/cxx-abi/abi/prop-72-comdat.html Added a lot of extensive tests, that tests functionality. llvm-svn: 230195
240 lines
7.4 KiB
Plaintext
240 lines
7.4 KiB
Plaintext
# This tests that comdat undef symbol is overridden by a global symbol.
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# comdat1.s
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#------------------------
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# .global g1
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# .section .foo,"axG",@progbits,g1,comdat
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#g1:
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# .word 5
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#
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#comdat2.s << \!
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#-----------------
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# .global g1
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# .section .foo,"axG",@progbits,g1,comdat
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#g1:
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# nop
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#
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#g1.c
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#-----------
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#extern int g1;
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#int fn() { return g1;}
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#
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#RUN: yaml2obj -format=elf -docnum 1 %s -o %t.comdat1.o
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#RUN: yaml2obj -format=elf -docnum 2 %s -o %t.comdat2.o
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#RUN: yaml2obj -format=elf -docnum 3 %s -o %t.g1.o
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#RUN: lld -flavor gnu -target x86_64 %t.comdat1.o %t.comdat2.o \
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#RUN: %t.g1.o --noinhibit-exec --output-filetype=yaml -o %t2.out.yaml
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#RUN: lld -flavor gnu -target x86_64 %t.comdat1.o %t.comdat2.o \
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#RUN: %t.g1.o --noinhibit-exec -o %t2.out
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#RUN: FileCheck %s -check-prefix=CHECKGROUP < %t2.out.yaml
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#RUN: llvm-readobj -sections %t2.out | FileCheck %s -check-prefix=CHECKGROUPSECTIONS
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#RUN: llvm-readobj -symbols %t2.out | FileCheck %s -check-prefix=CHECKSYMBOLS
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#CHECKGROUP: - name: g1
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#CHECKGROUP: scope: global
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#CHECKGROUP: content: [ 05, 00 ]
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#CHECKGROUP: section-name: .foo
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#CHECKGROUPSECTIONS: Section {
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#CHECKGROUPSECTIONS: Name: .foo
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#CHECKGROUPSECTIONS: Type: SHT_PROGBITS
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#CHECKGROUPSECTIONS: Flags [
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#CHECKGROUPSECTIONS: SHF_ALLOC
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#CHECKGROUPSECTIONS: SHF_EXECINSTR
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#CHECKGROUPSECTIONS: ]
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#CHECKGROUPSECTIONS: Size: 2
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#CHECKGROUPSECTIONS: }
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#CHECKSYMBOLS: Name: g1
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#CHECKSYMBOLS: Section: .foo
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#CHECKSYMBOLS: Name: fn
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#CHECKSYMBOLS: Section: .text
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---
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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OSABI: ELFOSABI_GNU
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Type: ET_REL
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Machine: EM_X86_64
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Sections:
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- Name: .group
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Type: SHT_GROUP
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Link: .symtab
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AddressAlign: 0x0000000000000004
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Info: g1
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Members:
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- SectionOrType: GRP_COMDAT
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- SectionOrType: .foo
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .data
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Type: SHT_PROGBITS
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Flags: [ SHF_WRITE, SHF_ALLOC ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .bss
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Type: SHT_NOBITS
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Flags: [ SHF_WRITE, SHF_ALLOC ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .foo
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR, SHF_GROUP ]
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AddressAlign: 0x0000000000000001
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Content: '0500'
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Symbols:
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Local:
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- Name: .text
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Type: STT_SECTION
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Section: .text
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- Name: .data
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Type: STT_SECTION
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Section: .data
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- Name: .bss
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Type: STT_SECTION
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Section: .bss
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- Name: .foo
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Type: STT_SECTION
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Section: .foo
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Global:
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- Name: g1
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Section: .foo
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...
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---
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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OSABI: ELFOSABI_GNU
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Type: ET_REL
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Machine: EM_X86_64
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Sections:
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- Name: .group
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Type: SHT_GROUP
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Link: .symtab
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AddressAlign: 0x0000000000000004
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Info: g1
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Members:
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- SectionOrType: GRP_COMDAT
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- SectionOrType: .foo
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .data
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Type: SHT_PROGBITS
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Flags: [ SHF_WRITE, SHF_ALLOC ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .bss
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Type: SHT_NOBITS
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Flags: [ SHF_WRITE, SHF_ALLOC ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .foo
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR, SHF_GROUP ]
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AddressAlign: 0x0000000000000001
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Content: '90'
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Symbols:
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Local:
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- Name: .text
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Type: STT_SECTION
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Section: .text
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- Name: .data
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Type: STT_SECTION
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Section: .data
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- Name: .bss
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Type: STT_SECTION
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Section: .bss
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- Name: .foo
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Type: STT_SECTION
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Section: .foo
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Global:
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- Name: g1
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Section: .foo
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...
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---
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FileHeader:
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Class: ELFCLASS64
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Data: ELFDATA2LSB
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OSABI: ELFOSABI_GNU
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Type: ET_REL
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Machine: EM_X86_64
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Sections:
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- Name: .text
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC, SHF_EXECINSTR ]
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AddressAlign: 0x0000000000000010
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Content: 554889E58B0425000000005DC3
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- Name: .rela.text
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Type: SHT_RELA
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Link: .symtab
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AddressAlign: 0x0000000000000008
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Info: .text
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Relocations:
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- Offset: 0x0000000000000007
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Symbol: g1
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Type: R_X86_64_32S
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- Name: .data
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Type: SHT_PROGBITS
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Flags: [ SHF_WRITE, SHF_ALLOC ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .bss
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Type: SHT_NOBITS
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Flags: [ SHF_WRITE, SHF_ALLOC ]
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AddressAlign: 0x0000000000000004
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Content: ''
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- Name: .comment
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Type: SHT_PROGBITS
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Flags: [ SHF_MERGE, SHF_STRINGS ]
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AddressAlign: 0x0000000000000001
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Content: 00636C616E672076657273696F6E20332E372E3020287472756E6B203232393535372920286C6C766D2F7472756E6B203232393536332900
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- Name: .note.GNU-stack
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Type: SHT_PROGBITS
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AddressAlign: 0x0000000000000001
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Content: ''
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- Name: .eh_frame
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Type: SHT_PROGBITS
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Flags: [ SHF_ALLOC ]
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AddressAlign: 0x0000000000000008
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Content: 1400000000000000037A5200017810011B0C0708900100001C0000001C000000000000000D00000000410E108602430D0600000000000000
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- Name: .rela.eh_frame
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Type: SHT_RELA
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Link: .symtab
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AddressAlign: 0x0000000000000008
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Info: .eh_frame
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Relocations:
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- Offset: 0x0000000000000020
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Symbol: .text
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Type: R_X86_64_PC32
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Symbols:
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Local:
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- Name: global-g1.c
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Type: STT_FILE
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- Name: .text
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Type: STT_SECTION
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Section: .text
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- Name: .data
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Type: STT_SECTION
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Section: .data
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- Name: .bss
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Type: STT_SECTION
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Section: .bss
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- Name: .comment
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Type: STT_SECTION
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Section: .comment
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- Name: .note.GNU-stack
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Type: STT_SECTION
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Section: .note.GNU-stack
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- Name: .eh_frame
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Type: STT_SECTION
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Section: .eh_frame
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Global:
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- Name: fn
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Type: STT_FUNC
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Section: .text
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Size: 0x000000000000000D
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- Name: g1
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...
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